Characterizing soil water dynamics on steep hillslopes from long-term lysimeter data

摘要: Summary Understanding soil water dynamics on hillslopes is of crucial importance to the prediction floods and other hydrological events in mountainous catchments, identification natural vegetation patterns, optimization agricultural land use. In principle, such information can be obtained from lysimeters, but most experimental lysimeter facilities have been installed flat terrain. This study presents a long-term high-resolution investigation moisture, surface subsurface flow using three large-scale lysimeters slope with 23.5° inclination landfill site Karlsruhe, Germany. Data 10-year observation period were evaluated for this study, including weekly moisture data by neutron probes, continuous discharge several layers within zone, hydrometeorological climate station. The results reveal (i) clear temporal spatial patterns variations down depth 250 cm, (ii) substantially higher faster percolation rates lower part field, indicating significant downhill at various depths profile, (iii) characteristic threshold values processes soil, associated hysteresis effect between processes. These used as basis improved numerical models simulation floods, distributions, patterns.